<template>
	<view>
		<my_search @gotoSearch="gotoSearch"></my_search>
		<view class="scroll-view-container">
			<!-- 左侧滑动 -->
			<scroll-view scroll-y class="left-scroll-view" :style="{height:wh+'px'}">
				<block  v-for="(item,i) in cateList" :key="item.cat_id">
					<view :class="['left-scroll-view-item',i==active?'active':'']" @click="changeCate(i)">{{item.cat_name}}</view>
				</block>
				
			</scroll-view>
			<!-- 右侧滑动 -->
			<scroll-view  scroll-y class="right-scroll-view" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="item2.cat_id">
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="item3.cat_id" @click="gotoGoodsDetail(item3.cat_id)">
							<image :src="item3.cat_icon.replace('api-ugo-dev','api-ugo-web')">
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		name:'Cate',
		data() {
			return {
				// 设备高度
				wh:0,
				active:0,
				// 商品分类列表
				cateList:[],
				// 商品二级分类
				cateLevel2:[],
				// 滚动条到顶部的距离
				scrollTop:0
			};
		},
		onLoad(){
			// 获取窗口可用高度，赋值给wh
			this.wh=uni.getSystemInfoSync().windowHeight;
			this.getcateList()
		},
		methods:{
			// 获取商品分类列表
			async getcateList(){
				let {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status==200){
					this.cateList=res.message
					this.cateLevel2=this.cateList[this.active].children
				}else uni.$showMsg()
			},
			// 点击切换商品分类
			changeCate(i){
				this.active=i
				this.getcateList()
				// this.scrollTop不能一直等于0，这样不会变化。让值在1px和0之间切换，就能更新了
				this.scrollTop=this.scrollTop==0?1:0
			},
			// 点击跳转到商品详情
			gotoGoodsDetail(id){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+id
				})
			},
			// 自定义事件，点击搜索触发
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
	.cate-lv2-title {
	  font-size: 12px;
	  font-weight: bold;
	  text-align: center;
	  padding: 15px 0;
	}
	.cate-lv3-list{
		display:flex;
		flex-wrap: wrap;
	}
	.cate-lv3-item{
		width: 33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom:10px;
		image{
			width:60px;
			height:60px;
		}
		text{
			font-size:12px;
		}
	}
}
</style>
